Portable hydraulic lifting device



Feb. 1, 1966 K. R. BOGH ETAL IORTABLE HYDRAULIC LIFTING DEVICE 2Sheets-Sheet 1 Filed Feb. 14, 1964 INVENTORS Mi #7 5096 Feb. 1, 1966 K.R. BOGH ETAL 3,232,464

PORTABLE HYDRAULIC LIFTING DEVICE Filed Feb. 14, 1964 2 Sheets-Sheet 2INVENTORY mm, R 50 BY 5/// F2 5 United States Patent 3,232,464 PDRTABLEHYDRAULIC LIFTING DEVICE Keith R. Bogh and Billy R. Bogh, both of Rte.5, Le Mars, Iowa Filed Feb. 14, 1964, Ser. No. 344,915 1 Claim. (Cl.214-512) Our invention relates to a portable lifting device.

An object of our invention is to provide a flat lifting and carryingdevice upon which any device or implement can be driven, and whichthereby will be raised by bydraulic or mechanical means, or acombination of both, and which device includes wheels journalled thereonso that the said implement, etc. can be transported.

A further object of our invention is to provide a device of thischaracter which is simple to operate and also includes certain lockingfeatures.

With these and other objects in view, our invention consists in theconstruction, arrangement, and combination of the various parts of ourdevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointed out in our claim, and illustrated in theaccompanying drawings, in which:

FIGURE 1 is a plan view of the device,

FIGURE 2 is a side elevation of FIGURE 1,

FIGURE 3 is a rear view of FIGURE 1,

FIGURE 4 is an enlarged sectional view taken generally along the lines44 of FIGURE 1,

FIGURE 5 is a side elevation showing the locking arrangement,

FIGURE 6 is a sectional detail,

FIGURE 7 is a portion of a modification, and

FIGURE 8 is a schematic hydraulic circuit.

In describing our invention we have used the character 10 to designateside members which are attached to the forwardly converging members 11,the character 12 indicating an extended tongue member, the characters 13and 14 indicating further transverse members, and attached across themembers 10 are the further transverse supports 15 upon which supportsare secured the planks 16.

Attached to the members 10 are the straps 17 which are attached (seeFIGURE 6) to the angularly positioned lengthened plates 18. Thecharacter 19 indicates a suitable hand operated hydraulic jack which isoperated by means of the lever 20, the jack having the base portion 21which will travel downwardly in the direction of the arrow 22 to raisethe forward end of the unit, and the further end 23 of the unit isusually attached to the hydraulic draw-bar of a tractor which can beraised or lowered as desired to thereby raise the front end of the unit.

The character 24 indicates posts attached to the members 10 and pivotedat 25 to these posts are the members 26, and journalied at the ends ofthe members 26 are the wheels 27, and the members 26 continue into thefurther portions 28 which continue into the further integral transverseportion 29, and pivoted at 3% to the member 29 is a piston rod 31 whichis attached to a suitable piston received in the hydraulic cylinder 33which is pivoted at 34 to the rear of the member 14. The character 35indicates bracing members.

Connected to the cylinder 33 is a suitable hose connection 36 whichpasses to the hydraulic system of the tractor and which is arranged toforce the piston rod 31 outwardly when required.

When it is desired to operate the unit, first the implement is drivenover the sloping surfaces 18 onto the platform and the hydraulic systemis actuated, and the piston rod 31 will be forced outwardly which willcorrespond- 3,232,464 Patented Feb. 1, 1966 ingly force the variousmembers 26, 28 and 29 to the dotted position of FIGURE 4, whereby thewheels 27 will bear against the ground due to the pivoting action at 25,which will completely raise the rear end of the unit, and ready forbeing transported. The front end is raised as explained and in certaincases where required, if the hydraulic draw bar is not available thefront end can be raised by means of the hand operated jack member 19.

The hydraulic pressure maintained in the circuit will keep the unit inraised position, although we have further provided the lockingarrangement shown in FIGURE 5 wherein the curved bars 37 are pivoted at38 to the portions 28, a transverse rod 39 being attached to the members37, the character 40 indicating a pair of stop pins which will lock themembers 37 so that the unit will be held in the raised position eventhough a hose, etc. may break.

FIGURES 7 and 8 illustrate a further modification wherein the front end23 is attached to a hydraulic jack 41 operated by a suitable hoseconnection at 42, the character 43 indicating the base of the jackoperated by the piston rod 44 and the piston 45, and in this type ofunit the front end can be raised by hydraulic means connection to thehydraulic pipe line 36 through the T-connection 46, the valve 47permitting independent operation of the jack 41. The character 48indicates further hitching portions.

It will now be noted that we have provided the advantages mentioned inthe objects of our invention with further advantages being apparent.

Some changes may be made in the construction and arrangement of theparts of our invention without departing from the real spirit andpurpose of our invention, and it is our intention to cover by our claimany modified forms of structure or use of mechanical equivalents whichmay be reasonably included within their scope.

We claim as our invention:

A portable hydraulic lifting device comprising a flat horizontallypositioned platform, a hydraulic lifting unit mounted at the rear ofsaid platform, said hydraulic lifting unit including support postsattached to said platform, arms pivotally attached to said supportposts, said arms including portions positioned co-planar with said armsand substantially at right angles thereto, wheels journalled at theouter ends of said arms, a transverse bar attached to the ends of saidportions, a hydraulic cylinder pivotally attached to the rear of saidplatform, a piston rod operated by said cylinder, said piston rod beingpivotally attached substantially medially of said transverse bar,whereby movement of said piston rod outwardly will raise said arms andlower said wheels to ground engaging position, to thereby raise saidplatform, sloping side members attached to said platform over whichdevices to be transported can be driven on to said platform, a handoperated hydraulic jack mounted at the forward end of said platform.

References ited by the Examiner UNITED STATES PATENTS 2,635,888 4/1953Bailiff 280414.5 X 2,648,546 8/1953 Falkenhagen 28043.23 X 2,704,0213/1955 Brundage 28043.23 2,922,534 1/1960 Vodraska et al. 214 512 X2,943,583 7/1960 Ryan 280-43.23 X 3,135,401 6/1964 Schramrn 214-512 XGERALD M. FORLENZA, Primary Examiner.

